WO2001018452A1

WO2001018452A1 - Gas lighter and fuel discharge device of the gas lighter

Info

Publication number: WO2001018452A1
Application number: PCT/JP2000/005983
Authority: WO
Inventors: Hidenori Takaya
Original assignee: Iwax Kabushiki Kaisha
Priority date: 1999-09-02
Filing date: 2000-09-04
Publication date: 2001-03-15
Also published as: AU6869400A; JP2001074240A; JP3110023B1; TW542888B

Abstract

A gas lighter having a flame length kept almost constant even when the temperature of liquid in a fuel tank is varied and a fuel discharge device thereof, wherein a new filter used in the fuel discharge device is formed so that a volume swelling ratio of the filter provided when the filter is immersed in liquefied fuel is increased according to an increase in temperature, an air bubble volume ratio is decreased, and a flow resistance of the liquefied gas is increased in order to uniform a passing flow of the liquefied gas irrespective of the temperature.

Description

Description Gas writer and its fuel discharge device

TECHNICAL FIELD The present invention relates to a gas lighter and a fuel discharge device incorporated and used therein. Background technology

A fuel discharge device, an ignition device, and a lever mechanism for controlling the fuel discharge device, an ignition device, and a lever mechanism are provided on an upper portion of a main body having a liquefied gas fuel tank. .

When the control lever is operated, the valve at the lower end of the fuel discharge nozzle is opened, and the liquefied fuel sucked up from the fuel tank by the cab is vaporized through the filter. The vaporized gaseous fuel is discharged from the valve through the fuel discharge nozzle to the outside air, and the gas emitted from the fuel discharge nozzle is ignited and burned by an ignition device that operates simultaneously with the opening of the valve. Swelling. However, since the saturated vapor pressure of liquefied gas used as fuel greatly changes with temperature, in a conventionally known gas writer, when the temperature of liquefied gas rises, the amount of gas that passes through a filter and evaporates is reduced. There was a problem in that the flame increased and the flame became too long, and on the contrary, when the temperature dropped, the flame became too short and it was easy to misfire.

The gas lighter is equipped with a flame length adjusting device so that the user can adjust the flame length to the desired length according to the temperature at the time of use. This device often had to be operated to adjust the flame length appropriately in response to fluctuations, which was inconvenient. Also, if the user When igniting a new lighter or carelessly igniting temperature fluctuations, a long flame could be generated, which was dangerous.

In this type of gas lighter, it is desirable that no vaporized gas be present in the fuel passage from the cab to suck up the fuel to the valve and the inside of the filter, and that the gas writer be constantly filled with liquefied gas. . In particular, if gas remains in the filter, the gas supply will not be sufficient until the filter is filled with liquid after the valve is opened, and the flame will be extremely small. is there. Disclosure of the invention

The present invention has been made to solve such a problem, and an object of the present invention is to provide a gas lighter in which the flame length does not change significantly even when the liquid temperature in the fuel tank changes, and a fuel discharger for the gas lighter. Equipment.

An object of the present invention is to provide a filter used in a fuel discharge device, in which the volume swelling ratio when immersed in liquefied fuel increases with temperature, the bubble volume ratio decreases, and the flow resistance of liquefied gas decreases. This is achieved by using a new filter that is configured to be increased and consequently the flow rate of the liquefied gas constant, independent of temperature.

The liquefied gas used in the gas lighter is propane, isobutane, normalbutane, or a mixture thereof. Since the composition is not constant, it is recommended to use normal hexane as the standard test solution. That is, the sample is immersed in normal hexane at room temperature for 1 hour, and the volume before and after the immersion is compared to calculate the volume swelling ratio.

As the filter used in the present invention, a filter having a volume swelling ratio of 10% or more and 80% or less, preferably 30% or more and 70% or less in a state of being formed into a part to be mounted on the lighter is used. It is recommended to use. The bulk density varies greatly depending not only on the composition of the resin used as the material, but also on the porosity or bulk density, the average cell diameter or the fiber diameter. In the present specification, the term “bulk density” simply refers to the bulk density in a state in which it is processed into a shape that can be mounted on a gas lighter.

Thus, by providing the filter with an appropriate porosity according to the swelling ratio of the filter material, the flame length can be made substantially constant within a certain temperature range.

The appropriate porosity can be determined by simple experiments and can be used to keep the flame length constant for practical use in the temperature range where gas lighters are normally used.

In a further preferred embodiment, it is recommended to provide a seal between the cavity holder and the main body to prevent the vaporized fuel from leaking. Brief explanation of drawings

FIG. 1 is a cross-sectional view showing a configuration of a main part of a first embodiment of a gas lighter according to the present invention.

FIG. 2 is a partially cutaway perspective view of the filter shown in FIG.

FIG. 3 is a schematic diagram showing an enlarged cross-sectional structure of the filter shown in FIG. 2 at normal temperature.

FIG. 4 is a schematic diagram showing an enlarged cross-sectional structure of the filter shown in FIG. 2 at a high temperature.

FIG. 5 is a schematic diagram showing an enlarged cross-sectional structure of the filter shown in FIG. 2 at a low temperature.

Fig. 6 shows the temperature of the gas lighter shown in Fig. 1 and the temperature of the known gas lighter.

6 is a graph showing flame length characteristics in comparison.

Figure 7 shows the 0-ring seal used on the outer wall of the holder 5 is a graph showing the effect of the above.

FIG. 8 is a cross-sectional view showing a configuration of a main part of a second embodiment of the gas lighter according to the present invention.

FIG. 9 is a cross-sectional view showing a configuration of a main part of a third embodiment of the gas lighter according to the present invention.

FIG. 10 is a saturated vapor pressure diagram of the fuel gas. Best Mode for Carrying Out the Invention First, a first embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a main body, and a lower portion of the main body 1 is connected to a fuel tank la, and an upper end portion lb is provided with a fuel discharge device 10 and an ignition device (not shown) and their control lever devices. It is a base that can be attached. The fuel tank la is filled with the liquefied fuel 5a, and the space above it is filled with the vaporized fuel 5b. At the upper end l b of the main body 1, a mounting screw hole l c for the fuel discharging device is formed, and the fuel discharging device 10 is mounted to the mounting screw hole l c.

The fuel discharging device 10 includes a valve assembly including a nozzle holder 11, a valve body 12 having a valve seat 12a, a nozzle 13 having a vent 13a, a coil spring 15, a 0 ring 17, and a valve 19, and a pin portion at the center. A nail-shaped member 23 made of a disk having a member 23a; a disk-shaped filter 25 made of a porous material and having a hole through which a pin portion 23a of the nail-shaped member 23 is inserted; a capillary 27 for sucking liquefied fuel; And a holder 29.

A valve 19 is fixed to the tip of the nozzle 13, a 0-ring 17, a coil spring 15 and a nozzle 13 are inserted into the nozzle holder 11, and a valve body is provided at the lower end of the nozzle holder 11. 12 is pressure The valve assembly is then assembled.

The nozzle 13 is constantly pressed toward the valve body 12 by the elastic force of the coil spring 15, and the valve 19 attached to the tip of the nozzle 13 closes the valve seat 12 a of the valve body 12.

The capillaries 27 are inserted into the capillaries holders 29, and are mounted together with the O-rings 33 in the mounting holes Id provided in the main body 1.On the upper end surface of the capillaries 27, the nail members 23 are provided. The pin portion 23a is placed with the pin portion 23a facing upward, the filter 25 is fitted into the pin portion 23a, and then the valve assembly described above is attached to the main body 1 together with the O-ring 33.

However, these configurations, functions and effects are the same as those of the well-known one except for the configuration of the filter 25 and the provision of the ring 33, so that the description is omitted here, and Only the configuration of the filter 25 and the operation and effect of the zero ring 33 will be described.

First, regarding the configuration of the filter 25, it has conventionally been considered that it is desirable that this filter be stable with respect to the liquid fuel to be used. In other words, it was thought that it would be desirable not to swell or deteriorate when immersed in liquid fuel.

Incidentally, the volume swelling ratio of a filter used in a conventionally known gas lighter is 2% or less.

In the present invention, a filter having a much higher swelling rate than that used in a conventionally known gas lighter is used.

Specifically, the filter used in the present invention was immersed in normal hexane at 23 ° C for 1 hour in a state processed into a part that can be used as it is in a gas lighter, and the volume before and after that was compared and calculated. The swelling ratio should be 10% or more and 80% or less, preferably 30% or more and 70% or less. The reason for using normal hexane as the standard has already been described. The filter is made of a porous material such as foamed polyurethane foam or other foamed resin foam made of a material having such a swelling ratio, a nonwoven fabric, a woven fabric, or a fine particle composite.

Such a material having a high swelling rate has a property that its swelling rate changes with temperature. The present invention utilizes this property to maintain a constant flame length over a wide temperature range.

The basic principle of the present invention will be described with reference to FIGS.

In the figure, reference numeral 25a denotes a hollow portion made of open cells in the filter 25, and 25b denotes a substantial portion made of a resin material. Fuel flows through cavity 25a and evaporates as the pressure drops.

Figure 3 shows a state of the filter at a temperature T _R is close to room temperature. At this time, let P be the saturated vapor pressure of the liquid fuel acting on the upstream side of the filter, and Q be the gas flow rate passing through the filter. The swelling ratio at this time is medium. State when the temperature becomes higher temperatures T _H than room temperature, it is shown in Figure 4. In this case, although the saturation vapor pressure of the liquid fuel acting on the upstream side of the filter is increased to P _H, the cavity portion 25a serving as a passage of the fuel so also it increases the swelling rate of the filter is constricted, increasing the gas flow rate is suppressed As a result, the gas flow rate Q at normal temperature is maintained.

As shown in Fig. 5, when the temperature drops below room temperature to 7, the saturated vapor pressure of the liquid fuel acting on the upstream side of the filter decreases by PJ, but the swelling rate of the filter decreases. Therefore, the hollow portion 25a serving as a fuel passage is enlarged, and the gas flow rate does not decrease. In this case, the gas flow rate Q at normal temperature is maintained.

In order to realize such automatic adjustment of the gas flow rate, it is necessary to appropriately set the porosity of the filter by experiments, etc., corresponding to the swelling rate of the filter.

Desired bulk density of the filter is generally 0.1 to a / cm ³ or so, Desirably, it is about 0.2 to 1.2 g / cm ³ .

It is recommended that the thickness of this filter be at least 0.6 mm, preferably 1 to 5 mm, in order to obtain a desired flame length in normal use, ie, a flame length of about 30 mm.

If as a material used poly U letter-down form, for example, the bulk density 0.02~0.08gA; m ³ of bulk density poly urethane foam is thermally compressed 0.2 to 1.2 g / cm ^3, a thickness of l~5mm Sea It is recommended that the material be punched into the desired shape.

By using a filter having such a high volume swelling ratio and an appropriate bulk density corresponding thereto, an effect of suppressing a change in flame length in a desired temperature range can be obtained.

FIG. 6 shows the flame length / temperature characteristics of the gas writer according to the present embodiment and a conventional product in comparison. From this figure, it can be seen from the figure that the flame length of the conventional product increases significantly with increasing temperature, while that of the present embodiment remains almost constant over a wide temperature range of 10 to 60 ° C. It turns out that it is.

Next, regarding the operation of the O-ring 33, by installing the O-ring 33, the vaporized fuel 5b in the fuel tank la passes through the gap between the cavity holder 29 and the inner surface of the main body 1. Can be prevented from entering the interior of the filter 25.

If the O-ring 33 is not provided, the vaporized fuel 5b enters the filter 25 and fills the inside of the filter 25. Then, the flame becomes unstable, and the change in flame length due to the temperature change becomes large.

Also, when the O-ring 33 is provided, when the valve is opened, the liquefied gas is actively vaporized inside the filter 25, so that the temperature decreases and the filter portion comes into contact with the filter. The difference in the saturated vapor pressure between the filter and the filter creates a compressive force on the filter, Since this compression force increases as the temperature increases, it contributes to stabilization of the flame length.However, if the O-ring 33 is not provided, a high vapor pressure and heat energy from the inside of the fuel tank la enter the filter. The supply reduces the filter's temperature drop and compression, so that the flame length changes significantly with temperature.

FIG. 7 is a characteristic diagram showing the effect of the O-ring 33 when a known filter is used.

From this figure, it is clear that the O-ring 33 has an effect of preventing the fluctuation of the flame length due to the temperature change, even for a known filter having a low volume swelling ratio.

Next, a second embodiment shown in FIG. 8 will be described.

In this case, a seal member 41 having a rectangular cross section is used instead of the above-described O-ring 33.

It will be apparent that the same effect as in the case of the first embodiment can be achieved by the seal member 41 having such a shape.

Next, a third embodiment of the present invention will be described with reference to FIG.

In this embodiment, in the second embodiment, a step lg on which the seal member 41 is provided is provided with a ridge lh. For this reason, when the seal member 41 is incorporated, the concave portion 41a corresponding to the convex line lh is formed on the seal member 41 side, so that the sealing function can be more reliably exerted.

The present invention is not limited to the above-described embodiment. For example, the present invention can be applied to all gas lighters including a known fuel discharge device, an ignition device, and a control device therefor. The material, composition, shape, dimensions, etc. of the material may be any as long as the object of the present invention can be achieved, and all the present invention can be easily conceived from the above description. Is included. Industrial use

Since the present invention is configured as described above, if the present invention is practiced, a gas lighter that can always maintain a stable combustion flame with a constant flame length without increasing the manufacturing cost and a fuel discharge device therefor are provided. Can be done.

Claims

The scope of the claims

1. In the upper part of the main body having the liquefied gas fuel tank, a fuel discharge device, an ignition device, and a lever mechanism for controlling them are provided, and in a gas writer in which the fuel tank is filled with liquefied gas fuel,

When the valve of the fuel discharging device is opened, the volume swelling ratio of the filter arranged in the fuel passage for vaporizing the liquefied fuel and supplying it to the nozzle increases or decreases as the temperature rises and falls. The gas lighter as described above, wherein the flow resistance of the fuel to the filter increases and decreases, the fluctuation of the fuel flow passing through the filter is suppressed, and the fluctuation of the flame length is suppressed.

2. The gas lighter according to claim 1, wherein the gas writer comprises a porous material having a volume swelling ratio of 10% or more and 80% or less when immersed in normal hexane having a filter force of 23 ° C for 1 hour.

3. The gas lighter according to claim 1, wherein the flame length is kept substantially constant irrespective of temperature fluctuations.

4. The gas lighter according to any one of claims 1 to 3, wherein the filter is made of a foamed resin foam.

5. The gas lighter according to any one of claims 1 to 3, wherein the filter is made of a nonwoven fabric. 6. The gas lighter according to any one of claims 1 to 3, wherein the filter is made of a woven fabric.

7. The gas lighter according to any one of claims 1 to 3, wherein the filter is made of a particulate composite.

8. The gas lighter according to any one of claims 1 to 7, wherein the filter is made of polyurethane.

9. Seal member between the holder (29) that holds the cavity (27) that sucks liquefied fuel from the fuel tank (la) and the body

The gas writer according to any one of claims 1 to 8, wherein (33) is provided.

10. Nozzle holder (11), valve body (12) provided with valve seat (12a) and connected to nozzle holder (11), and nozzle (13) slidably held by nozzle holder (11) And a coil spring (15) and 0-ring (17) inserted between the nozzle holder (11) and the nozzle (13), and a valve (19) attached to the tip of the nozzle (13). A valve assembly, a nail member (23) made of a disk having a pin portion (23a) in the center, and a pin portion (23a) of the nail member (23) made of a porous material are inserted through the center. In a fuel discharging device (10) comprising a disk-shaped filter (25) having a hole, a cab (27) for sucking liquefied fuel, and a cab (29) holding the cab (27). ,

The above-described fuel release device (10), wherein the volume swelling ratio of the finoleta (25) when immersed in normal hexane at 23 ° C for 1 hour is 10% or more and 80% or less.