WO1999037953A1 - Combustion wick of liquid fuel combustor - Google Patents

Abstract

A combustion wick (6) made of a porous material which comprises, in order to provide a slender flame in conformity with a combustor requirement when a liquid fuel is sucked up with the combustion wick for combustion at the tip end thereof, a suction portion (62) for sucking up the liquid fuel by capillarity and a tip-end combustion portion (61) used for combustion, wherein an outer covering layer (8) for restricting the volatilization of the liquid fuel is provided on the side faces excluding an upper end face (6a) of the combustion portion (61).

Description

 Jin Mei Hoi Liquid Fuel Combustor 燃 焼 Combustion Core Technical Field

 The present invention relates to a combustion wick that sucks and burns liquid fuel from a fuel tank by using a capillary phenomenon in a liquid fuel burning appliance such as a smoking device lighter and an igniter that uses alcohol-based liquid fuel, In particular, it relates to the structure of a combustion section that performs combustion.

 Technology

 Generally, as fuel for burning equipment such as lighters for smoking equipment, igniters, torches, and lighting equipment, alcohol fuel such as ethyl alcohol, petroleum benzene-based benzene fuel including gasoline, liquefaction of butane gas, propane gas, etc. Gas fuel is used.

 Depending on the type of fuel used, the performance, ease of use, and design structure of each combustion device differ, and each has its own characteristics.

 For example, in the case of benzene fuel using a mixture of petroleum benzene hydrocarbon compounds, this fuel is a mixture of compounds having different boiling points, and the benzene component having a low boiling point volatilizes in the early stage of use after ignition of a combustion appliance. The same applies to gasoline, in which volatile components move sequentially to hydrocarbons with higher boiling points, so that the fuel composition remaining in the combustion equipment changes according to the burning time, and this causes a change in flame length. In addition, benzene and gasoline have high volatility, and the combustion equipment that uses them requires a sealed structure that reduces volatilization from the fuel storage section and the combustion wick. The gas is volatilized and lost, the refueling frequency is high and complicated, and the benzene and gasoline have a peculiar smell and may not be preferred.

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 must have a pressure-resistant structure. Further, the flame length changes in accordance with the change in the gas pressure. In particular, the gas pressure has a characteristic that it greatly changes logarithmically with respect to temperature, and has a large change in the flame length with respect to temperature. In order to reduce this flame length change Special design measures to compensate for the temperature of the fuel supply mechanism of the combustion equipment are required, which complicates the structure and disadvantages the cost.

 On the other hand, in the case of alcohol fuel, liquid fuel mainly composed of alcohol such as lower monohydric alcohol such as ethyl alcohol, methyl alcohol, and propyl alcohol is liquid at room temperature, has a relatively low vapor pressure, and is used for fuel storage. A pressure-resistant container is not required, and the fuel tank and the wick are sealed with a structure that does not allow alcohol to evaporate. This is advantageous in terms of simplification of the structure of combustion equipment and cost.

 In addition, in a combustion device using a liquid fuel mainly composed of alcohol, as a means for supplying the liquid fuel from the fuel storage section to the combustion section, generally, the continuous pores are formed by utilizing the surface tension of the liquid fuel. Alternatively, a combustion wick is used, which sucks up the gaps of bundled fine fibers by capillary action and burns at the tip.

 Specifically, the above-mentioned combustion wick is made of a string-like twisted fiber, a bundle of glass fibers, or a combination of both, in which the glass fiber is wrapped with a cotton yarn to absorb the fuel, and a metal is used so that it cannot be unraveled. Using a wire wound with a thin wire, the lower end suction part functions to suck up fuel, and the upper end combustion part burns.

 However, in a burning appliance such as a lighter for a smoking article or an igniter using the above-mentioned wick, depending on the material and form of the wick, the initial flame length after ignition, the change in flame length, and the saturation flame Since the length and the thickness of the flame are different, it is necessary to configure so as to satisfy the required characteristics corresponding to the usage type of the burning appliance.

 That is, a lighter for a smoking article and an igniter are manufactured using the combustion wick of the conventional example described above, and when the leading end combustion part is ignited, the flame is formed by the gas in which the liquid fuel has volatilized from the leading end face and the outer periphery of the leading end. It is formed by burning, and the liquid fuel evaporates and rises more than the outer periphery of the lower part of the burning part. When ignited, a thicker and longer flame is formed. This combustion state is the same as the form of the flame due to the ignition of the candle.When examining the combustion wick for obtaining the required flame length, considering the continuous combustion, the combustion wick has a certain thickness, that is, the tip surface. Needs the size of However, there is a proportional relationship between the thickness of the wick and the thickness of the flame, and the thicker the wick, the larger the thickness of the flame.

And, for example, in the case of Kyugawa River Lighter as a burning appliance, the thickness of the flame is small for the purpose of igniting cigarettes. There are conflicting demands to reduce the thickness of the flame while securing it.

 Further, as for the ignition of the combustion wick as described above, it is necessary that the liquid fuel is present in a volatilized state in the vicinity of the combustion wick where the sparks due to the igniter stone or the discharge act. Moreover, in addition to fuel volatilized from the upper end face of the combustion wick, the presence of fuel volatilized from the side face of the wick is important for ensuring ignitability, especially at low temperatures, which greatly affects the ignition rate. It has been found.

 Furthermore, when designing a burning appliance, the igniting member that ignites by burning a spark to the wick has better ignitability when approaching the wick, but when the flame is thick, the edge of this flame is There is a problem that the temperature of the ignition member, such as a file vehicle, rises when approaching the ignition member. For example, when a file wheel is heated, heat is transferred to the plastic support and the support melts, causing the file to fall off due to the pressing force of the igniter stones pressed against the file wheel. May become unusable. In particular, when the combustion wick approaches the ignition member, the flow of air around the combustion wick changes, and the flame tends to expand toward the ignition member, which may cause the above-mentioned overheating problem.

 On the other hand, in the case of a combustion appliance using a liquid fuel mainly composed of alcohol, even if a material exhibiting a flame reaction is added to the fuel, the flame may not be easily seen. For this reason, there is a demand for further coloring the flame to further clarify the form of the flame.

 The present invention has been made in view of the above circumstances, and has as its object to provide a combustion wick for a liquid fuel combustion appliance capable of obtaining a flame form suitable for a purpose of use, particularly a thin and long flame.

 Disclosure of the invention

 The combustion wick of the liquid fuel combustion device of the present invention that has solved the above-mentioned problems includes a liquid fuel contained in a batting accommodated in a fuel tank. A combustion wick for burning in the combustion part, and an ignition member for igniting the combustion part, wherein the combustion wick is made of a porous material, and at least a liquid is provided on a side surface of the combustion part excluding an upper end face. It is characterized by providing an outer skin layer that suppresses fuel volatilization.

Further, the combustion wick provided with the outer skin layer may be provided so that the liquid fuel may evenly volatilize around the periphery of the fuel, or may be provided by a fuel tank for suppressing the liquid and water fuel volatilization in the fire member. It is provided to be smaller than the volatilization% suppression effect of the measurement surface. In that case, the f! PJ Γίιΐ By removing the skin layer, for example, in a slit shape and partially forming the skin layer, or by not forming the outer skin layer, it is possible to reduce the volatilization suppression effect of the liquid fuel as compared with other aspects. Then, the outer layer may be made of a material having no permeability to the liquid fuel.

 Regarding the outer skin layer provided on the entire circumference or partially on the side of the combustion core, the outer skin layer is formed as a porous film having a permeability lower than that of the liquid fuel inside the core, and the liquid fuel permeates and volatilizes from the surface. It is preferable to provide it so that

 For example, the outer layer is formed by applying or dipping a mixture of a metal oxide powder and a fixing agent, followed by drying and solidification. Further, the outer skin layer is formed by applying or dipping and solidifying a heat-resistant inorganic compound powder or a metal powder or a mixture of the mixture and a fixing agent. As the metal oxide powder, titanium oxide, aluminum oxide or the like is used alone or in combination. It is preferable to use a water glass material or a low-melting glass material made of sodium silicate or potassium silicate as the fixing agent. It is preferable that the thickness of the outer skin layer is set to a value between 0.2 and 0.5.

 The outer layer may be coated with a heat-resistant paint or dipped and dried. It is preferable that the outer layer contains a metal compound exhibiting a flame reaction. On the other hand, carbon may be added to the outer skin layer. After the formation of the outer skin layer, a coating solution containing carbon may be coated.

 The permeability of the liquid fuel in the outer layer may be different between the upper end of the combustion part and the other part.For example, the permeability may be higher at the upper end of the combustion part and lower at the lower part. Or, the reverse is provided. At that time, the thickness of the outer skin layer may be provided so as to be different between the thickness of the upper end portion of the combustion portion and the thickness of other portions.

 A tip end surface of the combustion wick provided with the outer skin layer may be formed as an inclined surface, and the inclined surface may be disposed facing the ignition member.

The combustion core is preferably formed of a heat-resistant material such as ceramic fiber or glass fiber into a rectangular rod shape having a rectangular cross section, and may be formed of porous ceramic or porous glass material. In addition, when the combustion core is made of a porous material that is compression-molded in a direction perpendicular to the axial direction, and when the volatilization from Iffi is large due to the formation of the outer skin ^, the compression during compression molding is performed. To prevent overheating of the young fire member. -If the amount of volatilization from the side is small as a whole due to the formation of the outer skin layer, arrange the surface orthogonal to the compression surface during compression molding toward the ignition member to increase the ignition rate. It may be.

 In the combustion wick of the liquid fuel combustion device of the present invention as described above, the length of the flame is ensured by suppressing and controlling the volatilization of the liquid fuel from the side of the combustion part to the extent that it can be ignited by forming the outer skin layer. While reducing the thickness. In other words, if the entire side of the combustion portion of the combustion wick is hermetically covered with a skin layer that is not permeable to liquid fuel, so that no fuel is volatilized from this side, the liquid fuel is the upper end surface of the combustion wick. Since the flame is formed only by the more volatile fuel, the flame becomes thin.However, since the ignition of the combustion wick is generally performed from the side, it is difficult to ignite if the liquid fuel does not volatilize from such a side. . In this regard, according to the present invention, ignition is possible by skipping the spark from the side surface, and in order not to increase the thickness of the flame, the liquid fuel permeates and volatilizes to the extent that the liquid fuel can be ignited from the outer peripheral side surface of the combustion portion of the combustion wick. Forming a porous outer layer or reducing the volatilization action on the side of the igniting member from that of the other side to enable good ignition by the igniting member and suck up liquid fuel on the upper end surface of the combustion core By exposing the surface of the combustion core material with high volatilization ability, a long and thin flame shape was obtained, and it became a combustion core that could perform general ignition.

 The liquid fuel mainly composed of alcohol includes, for example, a lower monohydric alcohol such as methyl alcohol, ethyl alcohol or propyl alcohol as a main component, and a saturated carbonized fuel such as hexane or heptane for coloring a flame. A mixture of hydrogen is used.

According to the combustion wick of the liquid fuel combustion device as described above, the combustion wick is made of a porous material, and at least the side of the combustion part excluding the upper end face is provided with volatilization of the liquid fuel from the side of the wick. By providing a skin layer to suppress, the fuel volatilized from the side of the ignition member side ensures ignitability from the side by the ignition member, while ensuring the size of the upper end surface of the combustion wick to some extent and from the upper end surface By suppressing the amount of fuel volatilized from the outer peripheral surface by the outer skin layer while securing the length of the flame due to sufficient fuel volatilization, it is possible to prevent the thickness of the flame, especially the thickness of the lower end portion from becoming large. This makes it possible to prevent the temperature of the fire member from rising due to the flame approaching the ignition member, and to obtain a thin and long flame form that has not been obtained by a simple structure. This increases the degree of self-mountain in the form of flame Thus, for example, characteristics suitable for the intended use of a burning appliance such as a lighter for a smoking article and an igniter can be obtained, and the commercial value thereof can be increased.

 When the volatilization suppressing action on the side of the ignition member side of the combustion core provided with the outer skin layer is made smaller than that of the other side, the amount of volatilization for ignition can be easily ensured, and the volatilization suppression on the other side can suppress flame. Can be easily achieved.

 Further, by forming the outer skin layer as described above, the hardness of the combustion portion of the combustion core is increased, the strength is increased, and the durable life of the combustion portion for use can be extended.

 Further, in the temporal change of the flame in the continuous combustion after the ignition, the flame length is rapidly increased immediately after the ignition, and the saturated flame length is short, so that suitable combustion characteristics of an igniter or the like can be obtained.

 In addition, the flame is mainly formed by the combustion of the fuel volatilized from the upper end face of the combustion part of the combustion wick, and does not depend on the amount of volatilization from the side of the combustion part. Therefore, it is easy to design a closed cap that covers the combustion part for volatilization prevention.

 By controlling the volatilization of fuel from the side of the combustion part by the formation of the outer skin layer as described above, a thin and long flame can be formed. The amount of fuel used has been reduced, and the number of times and time of use have been greatly increased for the same fuel amount.

 On the other hand, in the case of a burning appliance in which it is advantageous to see the shape of the flame in the burning state, the flame component in the outer layer is added to the flame by adding a flame component such as sodium to the outer layer. It can clarify the form of the flame by causing a color reaction and coloring the flame. In addition, even if the outer layer is coated with carbon, and a coat containing carbon is applied on the outer layer, the carbon is released in the same manner as burning, and a yellow color can be obtained in the flame. Becomes visually irritating.

 BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1A is an explanatory diagram showing a combustion state in the basic structure of the combustion wick of the present invention. FIG. 1B is a schematic diagram showing a combustion state of the combustion wick of the comparative example.

Fig. 2 shows the combustion state of 本 ^ in which the outer skin of the burning wick of the book -Illustrated illustration,

 FIG. 3 is a schematic cross-sectional view of a smoking equipment lye as an example of a liquid fuel combustion device incorporating a combustion wick according to an embodiment of the present invention,

 FIG. 4 is a schematic cross-sectional view of a smoking article lighter as an example of a liquid fuel burning appliance incorporating a combustion wick according to another embodiment,

 FIG. 5 is a schematic plan view of a smoking equipment lye as an example of a liquid fuel combustion device incorporating a combustion wick according to still another embodiment,

 FIG. 6 is a perspective view of an upper part of a combustion wick in another embodiment,

 Figure 7 is a cross-sectional view showing the structure of the combustor used in the experimental example.

 Fig. 8 is a graph showing the flame length change characteristics in Experimental Examples 1 and 2 together with Comparative Examples.

 FIG. 9 is a graph showing the flame length change characteristics in Experimental Example 3 together with a comparative example.

 FIG. 10 is a graph showing the flame length change characteristics with respect to the protruding length of the combustion part in Experimental Example 4.

 Figure 11 is a graph showing the relationship between the protruding length of the combustion part and the saturated flame length in Experimental Example 4.

 FIG. 12 is a graph showing the relationship between the outer skin layer thickness and various flame lengths in Experimental Example 6, FIG. 13 is a graph showing the relationship between the outer skin layer thickness and the flame thickness in Experimental Example 6, and FIG. Fig. 4 shows the ignitability of the combustion core in Experimental Example 7 when a slit with a width of 0 was provided on the outer skin layer of the compression surface of the combustion wick and the slit was placed toward the ignition member.

 Figure 14B is a diagram showing the ignitability when a slit with a width of 0.5 mm is provided on the outer skin layer of the compression surface of the combustion wick in Experimental Example Ί and placed toward the igniting member.

 Fig. 14C is a diagram showing the ignitability in a state in which a slit with a width of 1.0 is provided in the outer skin layer of the compression surface of the combustion wick in Experimental Example 7 and the slit is arranged toward the ignition member.

 Figure 14D shows the ignitability when a slit with a width of 2.0πππ is provided on the outer skin layer of the compression surface of the combustion core in Experimental Example に and placed toward the ignition member.

 Figure 14E is a diagram showing the ignitability in the state in which a slit of 3.0 dragons width was provided on the outer skin layer of the compression surface of the combustion wick and placed toward the ignition member in Experimental Example 部 材.

Fig. 15A shows an O mm-wide slot machine on the outer skin layer of the cross section of the combustion wick in the abrupt example Ί. A diagram showing ignitability in a state where the igniting member is disposed toward the igniting member,

 Figure 15B is a diagram showing the ignitability when a slit with a width of 0.5 mm is provided on the outer skin layer of the cut surface of the combustion wick in Experimental Example 7 and placed toward the ignition member.

 Fig. 15C shows the ignitability when a band of 1.0 band width is provided on the outer skin layer of the cut surface of the combustion wick in Experimental Example 7 and the slit is arranged toward the ignition member.

 Figure 15D shows the ignitability when a slit with a width of 2.0 mm is provided on the outer skin layer of the cut surface of the combustion wick in Experimental Example 配置 and placed toward the ignition member.

 FIG. 15E is a diagram showing the ignitability when a slit having a width of 3.0 mm is provided in the outer skin layer of the cut surface of the combustion wick in Experimental Example 7 and the slit is arranged toward the ignition member.

 BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, embodiments of the combustion wick of the liquid fuel combustion device of the present invention will be described with reference to the drawings.

 First, FIG. 1A shows the basic structure of the combustion wick of the present invention. The body of the combustion wick 6 is formed of a porous material, and a portion protruding above the wick holder 7 is provided in the combustion portion 61, and a batting 3 impregnated with liquid fuel described below below the wick holder 17 (see FIG. 3). The portion that contacts the is provided on the suction head 62.

 Then, a skin layer 8 for suppressing the volatilization of the liquid fuel from the side surface is provided on a part or the entire periphery of the combustion core 61 except the upper end surface 6a of the combustion portion 61. The outer skin layer 8 is made of a porous material having a permeability, for example, in which liquid fuel sucked up by capillary action penetrates the inside of the core and volatilizes from the surface, and the permeability is lower than that of the main body material inside the core. It is provided so that it becomes.

More specifically, the combustion core 6 is made of a porous material in which a capillary passage is formed inside ceramic fiber, acrylic fiber, glass fiber, porous ceramic, porous glass material, etc. Is formed, for example, in the shape of a square bar, and on the outer periphery of a portion held from the combustion portion 61 to the core holder 17, metal oxide powder such as titanium oxide and aluminum oxide, heat-resistant inorganic compound powder, metal powder, and the like. Then, a coating liquid or a heat-resistant paint obtained by mixing a water glass material made of sodium silicate, potassium silicate or the like or a fixing material made of a low-melting glass material is applied or dipped and dried to a thickness of 0.2 to It has a skin layer 8 of 0.5 mm. Then, the coating liquid is not applied to the upper end surface 6a of the combustion portion 61 so that the surface of the core material such as the ceramic fiber is exposed, or the end surface is cut after the application. Further, the relationship between the ignition performance and the thickness of the flame is adjusted by adjusting the coating thickness of the coating solution. Further, the tip surface 6a may be formed obliquely.

 FIG. 1B shows the combustion state of the combustion core 60 of the comparative example having no outer skin layer. The outer peripheral surface of the combustion part 61 has high permeability, and a large amount of fuel is indicated by the arrow. Is volatilized, and the flame ignited and burned on the side surface and the flame due to the volatile gas from the upper end surface 6a are integrated into a large, large flame as a whole. In particular, the lower end becomes thicker. In addition, the temperature rise due to the continuation of combustion after ignition causes an increase in the amount of volatilization from the front end face 6a and the outer peripheral face, and the flame becomes large and a saturated state as shown in the figure is obtained.

 On the other hand, in the combustion state of the combustion wick 6 according to the present invention shown in FIG. 1A, the fuel is volatilized from the front end surface 6a in the same manner as described above, but the outer layer 8 Due to the formation of fuel, the volatilization of the fuel is suppressed and reduced, and the flame igniting the volatile gas from this side is small and the whole flame has a narrower lower end, and the flame length is somewhat shorter, but the required length is obtained. . Then, even if the volatilization amount increases due to the temperature rise after ignition, the increase in the volatilization amount from the outer peripheral surface is suppressed, and the extension of the saturated flame length is suppressed. Further, since the formation of the flame is mainly performed by the volatilization of the fuel from the upper end surface 6a of the combustion portion 61 of the combustion core 6, the protrusion length of the combustion portion 61 from the core holder 7 is set to be about 3 bandages. It can be shorter than those without a skin layer.

FIG. 2 shows combustion in the case where the outer skin layer 8 is formed to be thicker to further reduce the fuel permeability on the side surface of the combustion portion 61, and when the permeation volatility from the outer skin layer 8 decreases, When the combustion portion 61 is ignited, a rising air current due to temperature is generated at the same time as the formation of a flame on the side surface of the combustion portion 61, and the fuel gas volatilized from the outer skin layer 8 rises without forming a flame on this side surface. However, the flame merges with the flame of the fuel gas volatilized from the upper end face 6a of the combustion part 61, and is burned. In this case, the thickness of the lower end of the flame is further reduced. In this way, the thickness and length of the flame can be set according to the intended use of the burning appliance. At this time, in order to increase the fire rate, the outer skin layer 8 on the side of the young fire side is partially or totally removed to reduce the size of the Sakugawa river and to reduce the fire volume.よ い You can make it bigger. -298 In addition, the shape of the flame can be further changed by changing the thickness of the coating so that the outer skin layer 8 has high permeability at the top and low at the bottom, or vice versa. It is.

 The amount of volatilization that has passed through the outer skin layer 8 needs to be sufficient to obtain ignitability, but the required amount varies depending on the ignition performance of the ignition member.

 Further, in order to make the shape and shape of the flame easy to see, a metal compound or carbon exhibiting a flame color reaction is added to the outer skin layer 8 or a paint in which carbon is mixed is coated on the outer skin layer 8.

<First embodiment>

 FIG. 3 shows a schematic cross-sectional structure of a lighter for a smoking device as an example of a liquid fuel combustion device incorporating the combustion wick 6 as described above. Also, specific examples of the wick 6 are shown.

Raiichi 1 has a bottomed cylindrical fuel tank 2, into which a batting 3 made of a fiber material impregnated and holding liquid fuel is inserted, and an upper lid 4 is provided at the top of the fuel tank 2. Are fixed to form a fuel storage unit 5 for storing liquid fuel. The filling 3 is filled into the bottom of the fuel tank 2 to form an upper space 2a. For example, the fuel tank 2 is a molded article made of polypropylene and has an inner volume of 5 cm ³ . The batting 3 is made by loading a 6 denier polypropylene fiber into the fuel tank 2 at a density of 0.05 g / cm ³ , and the batting 3 has 95 wt% of ethyl alcohol and n-hexane. 4 g of liquid fuel mixed with 5 wt% is impregnated and stored.

 Further, a metal core holder 7 is fixedly penetrating the upper lid 4 vertically into the fuel tank 2. A rod-shaped combustion core 6 is mounted on the core holder 17 in the vertical direction. In the combustion wick 6, a combustion portion 61 at the tip projecting upward from the wick holder 7 and a suction portion 62 contacting the batting 3 below are integrally formed of the same material.

The combustion core 6 is made of ceramic fiber. For example, a ceramic fiber obtained by fiberizing a raw material mainly composed of alumina and silica having a thickness of 2.8 μm is combined with a fine binder I and a hardened material. Add the agent to form a plate so that the packing density of the fiber is 0.16 g / cm ^;! , Cut it, and cut it into pieces. mm shape The provided one is inserted into the core holder 17 having an inner diameter of 5.0 mm, an outer diameter of 6.0 mm ^, and a length of 7.0. The combustion portion 61 of the combustion wick 6 is fixed so that the protruding length from the upper end face of the wick holder 17 is 3 mm, and the suction portion 62 is 45 from the lower end. Has been inserted.

 At least the outer peripheral side surface of the combustion portion 61 of the combustion core 6 is covered with a skin layer 8 which is porous and has a lower liquid fuel permeability than the internal material. The outer skin layer 8 is formed on the side surface of a predetermined length (for example, 10 bands) from the upper end of the combustion core 6, and the above-mentioned ceramic fiber surface is exposed on the upper end surface 6 a and the side surface of the suction part 62. I have.

 The outer layer 8 in this example was prepared by mixing a mixture of sodium silicate 5 O wt% + water 50 ^% at a mixing ratio of 7 O wt% and titanium dioxide at a mixing ratio of 3 O wt%. Then, this coating liquid is applied so that the thickness after drying is 0.3 mm, and then dried to form a coating liquid.

 The combustion wick 6 as described above sucks up the liquid fuel impregnated in the batting 3 by the suction portion 6 2 by capillary action, and supplies the sucked liquid fuel to the combustion section 6 1, and the wick holder The combustion part 61 projecting upward from 7 is ignited and generates flame to burn.

 The combustion core 6 may be made of different materials for the combustion part 61 and the suction part 62. In this case, the combustion part 61 is formed of the above-mentioned ceramic fiber, 62 is made of, for example, acrylic fiber, and is formed by contacting and joining the two. This suction part 62 is formed by adding a binder and a curing agent to acrylic fiber having a fiber thickness of 3 denier, bundling and solidifying it into a rod shape, and has a porosity of 60% after fixed molding, and an outer diameter of 60%. It is formed in 3.4 mm 0.

 Further, an ignition member 10 is disposed on the upper lid 4 so as to face the tip of the combustion section 61, and the ignition member 10 is movable vertically in a bracket 11 fixed to the upper lid 4. The igniter stone 12 is inserted, and a rotating file 13 is provided on the upper cover of the bracket 11. The tip of the igniter stone 12 is pressed around the rotating file 13 by the urging force of the stone pressing spring 14. It is provided so that sparks fly toward the combustion wick 6 by the rotating operation of the rotating file 13.

The combustion part 61 can be closed with the protruding part of the wick holder 7. A closing cap 16 is provided, and the closing cap 16 is rotatably supported at one end of the upper surface of the upper lid 4 in the fuel tank 2 by a pin 1. On the inner surface of the closing cap 16, an inner lid 16 a is provided, which surrounds the outer peripheral portion of the core holder 7 and covers and seals the tip of the combustion portion 61. An O-ring 19 is horizontally attached to the outer periphery of the core holder 7, and is pressed against the inner peripheral surface of the inner lid 16a to improve the airtightness. A top plate 18 is provided on the upper surface of the upper lid 4.

 Note that a gap formed between the circular inner peripheral surface of the core holder 7 and the rectangular outer peripheral surface of the combustion portion 61 has a ventilation hole communicating the upper space 2a in the fuel tank 2 with the outside. Function as

 Using the smoking article lighter 1 shown in Fig. 1 as described above, the change in flame length when burning continuously from ignition was measured.The flame length immediately after ignition was 18 mm, and immediately after that the flame length was measured. After 5 seconds, the flame length became 35 marauders, and then 10 seconds later, the flame lengthened to equilibrium with 38 marauders (see Experimental Example 1 in Fig. 6). In addition, the thickness of the fire was up to seven marauders. Further, the flame in the combustion state after a lapse of a predetermined time after the ignition exhibited orange color accompanying the flame reaction of sodium silicate in the outer skin layer 8. Thus, a thin and long flame shape that satisfies the required combustion conditions as a smoker lighter was obtained. It should be noted that a similar skin layer could be formed even when aluminum oxide powder (alumina powder) was blended in place of the titanium dioxide. Similar skin layers could be formed by adding potassium silicate instead of sodium silicate.

Second Embodiment>

 In this example, the material for forming the outer layer 8 is different, and low-melting glass (glass frit) is used as a fixing agent (binder), and the other components are provided in the same manner as in the first embodiment.

The outer layer 8 in this example is prepared by mixing 8 wt% of glass frit and O wt% of titanium dioxide, and mixing it with a 5% solution of polyvinyl alcohol as a binder in a ratio of 1: 1 to prepare a coating liquid. Then, this coating solution is applied (0.3 band thickness) to the outer periphery of the combustion portion 61 of the combustion core 6 from the upper end surface to a length of 1 Omm from the upper end surface, and after drying, 800 ° C x It is sintered for 10 minutes (heating rate 10 ° C / min). The composition example of the above glass frit is: Si 0: 10%, Zn O: 65%, and B: 25%. When the flame length after ignition was observed using Rai Yuichi in the embodiment of the present example, the flame length immediately after ignition was 20 recitations, and after 5 seconds, it reached 40 recitations and was saturated as it was Then, an equilibrium state was established. Further, the maximum thickness of the flame was 7 mm, and a thin and long flame shape similar to that of the first embodiment was obtained.

<Third embodiment>

 In this example, a coat layer is further provided on the surface of the outer skin layer 8 of the combustion core 6 formed in the same manner as in the first embodiment.

 In other words, the outer layer 8 contains carbon on the surface coated with a coating solution containing 70 wt% of a mixture of 50 wt% of sodium silicate + 50 wt% of water and 30 wt% of titanium dioxide. The oily ink is cooled and dried.

 When the change in flame length after ignition was measured using the above lighter, the same results as in the first embodiment were obtained for the change in flame length after ignition and the thickness of the flame. Due to the formation of the coat layer, the flame further developed an orange color due to the flame color action of carbon.

Fourth embodiment>

 In this example, as shown in FIG. 4, the tip surface 6a of the combustion core 6 provided with the outer skin layer 8 is formed as an inclined surface, and the inclined end surface 6a is arranged facing the ignition member 10.

 The inclined tip surface 6a of the combustion core 6 is opposed to the scattering of sparks caused by the rotation of the rotating file 13 so that the tip surface 6a is susceptible to sparks and the ignition performance is improved. Depending on the type or thickness of 8, the structure is effective for improving ignitability when fuel volatilization from the side surface on which the outer skin layer 8 is provided is small.

<Fifth embodiment>

 In this example, the outer shape of the combustion core 6 is the same as that of the first embodiment, and relates to the porous material inside the combustion core 6, and the material density on a part of the surface is increased. The combustion wick 6 is formed of the above-described ceramic fiber, and a small amount of an organic binder and a curing agent is added to the ceramic fiber, compression-molded into a plate shape, and cut into a cross section of 3 nm x 4 nmi. It is provided in the shape of a square having a length of 7 mm and having a length of 7 mm.

The combustion wick 6 fabricated as described above is in a direction intersecting with its axial direction (longitudinal direction) ifi. The compression surface (the surface that receives the pressing force at the time of compression) has the property that the material density is higher than the inside and the permeability of liquid fuel is low.

 When the suppression of the volatilization of the liquid fuel from the side surface of the combustion core 6 by the outer skin layer 8 is small, the compression surface of the combustion core 6 is disposed toward the ignition member 10, and the cut surface is So that it is facing toward you. According to this arrangement, the compressed surface of the combustion wick 6 has less fuel volatilization than the cut surface, and the swelling of the flame at the portion facing the ignition member 10 is smaller than when the cut surface is opposed. Although the flame as a whole is not so thin, contact of the flame with the ignition member 10 can be suppressed, and overheating can be prevented.

 Further, when the volatilization of the liquid fuel from the side surface of the combustion core 6 by the outer skin layer 8 is large, a cut surface orthogonal to the compression surface of the combustion core 6 is disposed toward the ignition member 10, The compression surface is directed to the side. According to this arrangement, the cut section of the combustion wick 6 has more fuel volatilized than the compressed surface, and the amount of liquid fuel volatilized in a portion facing the ignition member 10 is increased, so that the ignition member 10 ignites. The rate can be improved, and the flame as a whole can be made thinner. The relationship between the orientation of the compression surface and the ignition rate is shown in Experimental Example 7 described later.

Sixth embodiment>

 In this example, the volatilization suppressing effect of the liquid fuel on the side surface 6b on the ignition member 10 side of the combustion core 6 having the outer skin layer 8 is provided to be smaller than the volatilization suppressing effect on the other side surfaces. FIG. 5 is a plan view of the light source 1 provided with the combustion core 6 of the present embodiment without the closing cap 16 .The combustion core 6 is made of ceramic fiber and has a cross section of 3 dragons X 3 mm. It is rectangular and has a length of 7 O mm.The outer layer 8 is formed on the other three sides except for the side 6 b on the side of the ignited member 10 from the upper end face 6 a to the length of 10 marauders. Become. The outer layer 8 is composed of a mixture of 70% by weight of potassium silicate and 30% by weight of titanium dioxide, applied to a thickness of 0.3 mm, dried, and the upper surface 6 of the combustion core 6 The inner material is exposed without coating the outer skin layer 8 on a and the side surface 6 b on the ignition member 10 side. The combustion wick 6 is inserted and fixed in the wick holder 17 so that the protrusion length becomes 3 faces. Others are the same as in the first embodiment.

In the embodiment of the present example, the thickness of the flame in the combustion state of Rai-Yu 1 1 is Wakasen, but the swelling from the i !! ij plane is suppressed by A thin, long flame shape was obtained. The ignitability is good because the amount of volatilization from the side surface 6b on the igniting member 10 side is large, and the position of the combustion wick 6 with respect to the igniting member 10 is changed as in Experimental Example 7 described later. In the ignition test, the distance from the center line of the rotating file 13 to the center line of the combustion wick 6 was 7 to 12 A good ignition rate was obtained over a wide range of end faces from 1 to 6 mm.

 <Seventh embodiment>

 This example is another example in which the volatilization suppressing effect of the liquid fuel on the side surface 6b on the ignition member 10 side of the combustion core 6 on which the outer skin layer 8 is formed is smaller than the volatilization suppressing effect on the other side surface.

 FIG. 6 shows only the outer shape of the tip portion of the combustion wick 6, and the combustion wick 6, which is configured in the same manner as in the sixth embodiment, extends over the entire circumference within a range of 10 bands from the upper end of the combustion portion 61. A skin layer 8 having the same composition as in the previous example was provided, and the center of the skin layer 8 on the side surface 6 on the ignition member 10 side of the combustion part 61 was a predetermined width in the vertical direction (0.5 to 2 thighs). By removing the removed slit 8a and exposing the core material, the volatilization suppressing action of the liquid fuel on the side face 6b on the ignition member 10 side is made smaller than the volatilization suppressing action on the other side face.

 The thickness of the flame of the lighter incorporating the combustion wick 6 according to the embodiment of the present embodiment in the ignited state is slightly expanded to the igniting member 10 side due to the size of the slit width, but as a whole, the side surface is formed by the outer skin layer 8. Evaporation from the gas was suppressed and a thin and long flame shape was obtained. Furthermore, the ignitability is good because the amount of volatilization from the side surface 6b on the igniting member 10 side is increased. As shown in Experimental Example 7 described later, the igniting member 10 When the ignition test was performed with the position changed, the slit width was 1 band, the distance from the center line of the rotating file 13 to the center line of the combustion wick 6 was 8 to 12 mm, and Good ignition performance was obtained over a wide range of the upper end face of the igniter stone 12 upward from the upper end face 6a to -1 to 6 mm.

Eighth Embodiment>

In this row, the material of the combustion core 6 is made of a different material, and a binder is added to acryl fiber, extruded, and formed into a round bar. The tip portion is a combustion portion 61, and an outer skin 8 is formed outside the combustion portion 61 in the same manner as in the first to third embodiments. The combustion core 6 made of acrylic fiber is a material having a high liquid fuel wicking ability, and has lower heat resistance than the combustion core 6 made of ceramic fiber. For example, heat resistance using sodium silicate as a fixing agent is used. By forming a porous outer skin layer 8 with a core, it becomes a combustion core 6 that can withstand sufficient use, and the same characteristics as those of the combustion core 6 made of ceramic fiber can be obtained in terms of the characteristics of flame shape and flame length during combustion. Was.

 Next, Experimental Examples 1 to 7 in which the effect of the combustion wick of the present invention was confirmed will be described. The combustion wick used in Experimental Examples 1 to 6 was a long and narrow board made by adding a binder to ceramic fibers having a fiber diameter of 2.8 m and adding a binder to form a board with a thickness of 3 mm and solidifying it to a width of 4 mm. It has a rod shape and the combustion part and the suction part are integrated with the same material. The above wick was stored in the experimental combustor 100 shown in Fig. 7, and the fuel tank 2 of the combustor 100 was filled with batting 3 made of polypropylene fiber, and 95% of absolute ethanol and 5% of hexane. Is added, and the lower suction part 62 of the combustion wick 6 is inserted into the batting 3.The combustion part 61 passes upward through the wick holder 7 provided on the upper wall of the fuel tank 2. A vent hole 20 is formed in the upper wall of the fuel tank 2 so as to protrude. Then, various outer skin layers 8 were formed on the outer peripheral surface within a range of 1 O mm from the upper end of the combustion portion 61 of the combustion core 6, and a combustion test was performed.

Experiment 1>

 The outer skin layer in this experiment was the same as that in the first embodiment, that is, 50% by weight of water was mixed with 50% by weight of sodium silicate, and 70% by weight of titanium dioxide was added to 70% by weight of this water glass solution. A mixture obtained by adding 0 wt%, stirring and mixing is applied and dried, and a breathable porous coating film is applied to the surface of the combustion wick to a thickness of 0.3 mm. The protruding length of the burning part from the wick holder in the above-mentioned wick is 3 bandages, and the flame length change and flame thickness after ignition are measured. Compared to the one.

Fig. 8 shows the measurement results. The initial flame length immediately after ignition is about 27 mm in the comparative example, whereas the initial flame length according to the present invention is as short as about 20 thighs. However, the extension of the flame length after that according to the present invention was fast, the flame length after 10 seconds of ignition was 35 in the comparative example and 41 min in the present invention, and the saturated flame length after that was less than that in the bite example. In the present invention, it is 4 lmm. On the other hand, the thickness of the flame was 13 mm (^) in the comparative example, whereas it was reduced to 7 mm in the present invention, and the flame was colored by sodium in sodium fixate as sodium carbonate. The reaction turned orange-yellow and the shape of the flame became easier to see, showing the combustion characteristics suitable for use in igniters, especially lighters for smoking gear.

<Experimental example 2>

 The outer skin layer in this experiment was obtained by changing the sodium silicate in Experimental Example 1 to a calcium silicate rim, and was otherwise provided in the same manner.

 The measurement results in the combustion test are shown in FIG. 8 above. The flame length change tendency is the same as in Experimental Example 1. The initial flame length is 18 and the flame length after 10 seconds and the saturated flame length are about 38. He became a marauder, and the thickness of the flame was seven plates, and a thin and long flame shape was obtained.

Experiment 3>

Skin layer in this experiment, the same as the second embodiment, i.e., Garasufuri' Doo (Si_〇 _{2: 1 0%, ZnO:} 6 5%, B 2 0 3: 2 5) 8 O wt% The mixture was prepared by applying a mixture of 2% by weight of titanium dioxide and sintering as a coating solution, and the others were the same as in Experimental Example 1. The measurement results are shown in FIG.

 In this experimental example, the flame length change tendency was the same as in experimental example 1.The initial flame length was 20 bandits, the flame length after 10 seconds and the saturated flame length were about 40 bandages, and the thickness of the flame was Seven thighs, a thin and long flame shape was obtained.

<Experimental example 4>

 This experiment measured the change in flame length when the length of the protruding part of the combustion part from the core holder was changed.

 The outer skin layer in this experiment had the same composition as that of the above-mentioned Experimental Example 1 (first embodiment), and the protruding length of the combustion portion from the core holder 1 was l mn! When the flame length was changed to ~ 4 mm, the time-dependent change in flame length during combustion was measured, and the results are shown in Fig. 10. Fig. 11 shows the relationship between the saturation flame length and the protrusion length.

The longer the protruding length of the combustion part, the longer the saturated flame length. This is due to the fact that the fuel volatile gas from the outer peripheral side surface corresponding to the protruding length of the combustion part is added to the fuel volatile gas from the front end surface of the combustion core, and as the protruding length becomes longer, the combustion core becomes more deformed. Volume and liquid

Reaches the limit (see Fig. 11).

 From the above points, the protruding length of the igniter is set so that the required flammable flame length of the igniter is obtained up to the point where the saturated flame length reaches the limit according to its thickness and suction capacity. . This is advantageous in design since it is possible to reduce the length of the protruding portion of the combustion wick from the wick holder 1 as compared with the case where the outer skin layer is not provided on the outer periphery of the combustion portion. In other words, the design of the combustion wick can be simplified by providing a closing cap so that the fuel does not volatilize during storage of the combustion equipment and sealing the tip of the combustion wick by shortening the protruding length of the combustion wick.

 <Experimental example 5>

 In this experiment, the change in fuel consumption due to the formation of the outer skin layer was determined. The outer skin layer and other forms in this experiment are the same as those in Experimental Example 1 described above.

 In the experiment, first, the combustion part of the wick was ignited, and after burning for 2.5 seconds, the fire was extinguished. The process of leaving the wick closed and left for 5 seconds was repeated 25 times to make one cycle. After this one cycle of ignition, the temperature of the combustion part has risen, so leave the combustion core closed for at least 5 minutes, return it to room temperature, and then perform one cycle of the next ignition cycle . Then, the above ignition cycle was performed until 3.3 g of liquid fuel was put into the fuel tank at the start of the experiment until the wick no longer ignited. Table 1 below shows the results of calculating the fuel consumption per ignition from the total number of ignitions and the total fuel consumption (initial fuel amount-residual fuel amount). The amount of residual fuel is fuel that is held in batting but cannot be sucked up.

 In the combustion wick having an outer skin layer of the present invention, fuel volatilization from the side of the combustion part is suppressed, and the thickness of the flame is reduced, so that the fuel consumption is significantly reduced as compared with the comparative example having no outer skin layer. ing.

In this experiment, the combustion time was set to 2.5 seconds. The flame length immediately after ignition was different between the case with the outer skin layer and the case without the outer layer as described above, but 2.5 seconds passed after the ignition. At this point, the flame length was the same as 28 mm (see Fig. 8), so this time was set. In addition, in the case of a smoking article rye, the burning time for igniting ordinary cigarettes is less than 2.5 seconds. 【table 1】

 <Experimental example 6>

 In this experiment, the relationship between the thickness of the skin layer and the flame length was determined. The outer skin layer in this experiment has the same composition as that of the first experimental example, and the configuration other than the outer skin layer thickness is provided similarly.

 Then, the thickness of the outer skin layer was changed to 0.1 丽 to 0.7 thigh by changing the application amount of the coating solution, and a combustion test was performed. The outer skin layer thickness, the initial flame length, and the flame length after 2 seconds were measured. Fig. 12 shows the relationship with the saturated flame length, and Fig. 13 shows the relationship between the thickness of the outer skin layer and the flame thickness.

 From these results, the thickness of the outer skin layer is related to its volatilization-suppressing action. As the thickness increases, the length of various flames decreases, and the thickness of the flame decreases, and the effect is 0.3 πιπι. If it exceeds, it saturates and becomes almost constant. For this reason, it is preferable that the thickness of the outer skin layer is set to 0.2 to 0.5 mm.

 From the experiments described above, by applying the porous skin layer to the burning part of the wick, the speed of flame extension from the initial flame length immediately after ignition is increased and the flame length is kept shorter than that without the saturated flame length. At the same time, it was found that the thickness of the flame could be reduced.

Experiment 7>

It is an ignition test of Rai Yuichi using the combustion wick according to the seventh embodiment. That is, a slit of a predetermined width is formed in the center of the side surface of the ignition member, and the slit width is changed from 0 thigh (full skin layer) to 3 dragons (all exposed), and the distance from the ignition member and The height has changed. The materials of the fiber core and the outer skin layer are the same as in the seventh embodiment. . The results of the ignition test are shown in Figs. 14A to 14E and Figs. 15A to 15〜. The distance from the igniting member is the distance L from the center of contact between the igniter and the rotating file to the center line of the combustion wick, and is varied from 7 to 12 mm in every l mm. The diameter of the rotating file is 6 mm, the diameter of the cross wheel is 8 and the diameter of the pyrotechnic stone is 2 mm. On the other hand, for the height H, the position where the contact point between the rotating file and the pyrotechnic stone moves upward with respect to the upper end position of the combustion wick is defined as plus, and the position below is defined as minus. At each distance L, the height H was varied from 12 to 6 mm for each thigh.

 Fig. 148 to Fig. 14E show the case where a slit is provided on the outer skin layer of the compression surface of the combustion wick and placed toward the ignition member, and Figs. 15A to 15E are orthogonal to the compression surface. This is a case where a slit is provided in the outer skin layer of the cut surface and the slit is arranged toward the ignition member.

 In the ignition test, the combustion wick and the igniting member were performed in each positional relationship of the experimental range surrounded by the solid line, and the good ignition range ignited by one or two ignition operations was performed on a white background and three or more ignition operations were performed. The range of required ignition failure is indicated by oblique lines.

 From Figures 14A to 14E and Figures 15A to 15E, if a slit with a slit width of about 1 band or more is formed, good ignitability over a wide range is obtained. I have. In addition, when the cut surface of the combustion wick faces the ignition member, the ignitable range is larger than when the compression surface is directed.

Claims

Claim side

(1) Liquid fuel is contained in the batting housed in the fuel tank, and the batting and the suction part come into contact with each other to draw up the liquid fuel by capillary action and burn in the leading end combustion part. A combustion member comprising a porous material, and a skin layer for suppressing volatilization of the liquid fuel provided on at least a side surface of the combustion part except for an upper end surface. A combustion wick for a liquid fuel combustion appliance characterized by the following.

 (2) The combustion wick according to claim 1, wherein the combustion wick provided with the outer skin layer has a volatilization suppressing effect of the liquid fuel on the side surface on the ignition member side smaller than a volatilization suppressing effect on the other side surface. .

 (3) The combustion wick according to claim 2, wherein a skin layer is partially formed on a side surface of the combustion wick on the side of the ignition member.

 (4) The combustion wick according to claim 2, wherein a skin layer is not formed on a side surface of the combustion wick on the side of the ignition member.

 (5) The combustion wick according to claim 1, wherein the outer skin layer is a porous film having a permeability lower than that of the liquid fuel inside the wick.

 (6) The combustion wick according to claim 1, wherein the outer skin layer is formed by applying or immersing dry solidification of a mixture of a metal oxide powder and a fixing agent.

 (7) The combustion wick according to claim 6, wherein the metal oxide powder contains at least one of titanium oxide and aluminum oxide.

 (8) The combustion core according to claim 1, wherein the outer skin layer is formed by applying or dipping and solidifying a mixture of a heat-resistant inorganic compound powder or a metal powder or a mixture thereof and a fixing agent. .

 (9) The combustion wick according to claim 6 or 8, wherein the fixing agent is a water glass material made of sodium silicate or potassium silicate.

 (10) The combustion wick according to claim 6 or 8, wherein the fixing agent is a low-melting glass material.

(11) The outer layer is formed by applying or dipping and drying a heat-resistant paint. The combustion wick according to claim 1, wherein

 (12) The combustion wick according to claim 1, wherein the outer skin layer contains a metal compound exhibiting a flame reaction.

 (13) The combustion wick according to claim 1, wherein carbon is added to the outer skin layer.

 (1) The combustion wick according to claim 1, characterized in that a coating solution containing bonbon is coated after the formation of the outer skin layer.

 (15) The combustion wick according to claim 1, wherein the permeability of the liquid fuel in the outer layer is different between an upper end portion of a combustion portion and other portions.

 (16) The combustion wick according to claim 15, wherein the outer skin layer has a thickness different from a thickness of an upper end portion of a combustion portion and a thickness of other portions.

 (17) The thickness of the outer skin layer is 0.2mn! The combustion wick according to claim 1, wherein the number of the thighs is 0.5 to 0.5.

 (18) The combustion wick according to claim 1 or 2, wherein the combustion wick is formed of a heat-resistant material such as ceramic fiber or glass fiber into a rectangular rod shape having a rectangular cross section.

(19) The combustion wick according to claim 1 or 2, wherein the combustion wick is made of a porous ceramic or a porous glass material.

 (20) The combustion wick according to claim 1, wherein a tip surface of the combustion wick provided with the outer skin layer is formed on an inclined surface, and the inclined surface is disposed toward the ignition member.

 (21) When the combustion wick is made of a porous material that is compression-molded in a direction orthogonal to the axial direction of the combustion wick, and the amount of volatilization from the side as a whole is large due to the formation of an outer skin layer, the compression is performed. 19. The combustion wick according to claim 1, wherein the compression surface at the time of molding is disposed facing the ignition member.

 (22) In the case where the combustion wick is made of a porous material that is compression-molded in a direction orthogonal to the axial direction of the combustion wick, and the amount of volatilization from the side surface as a whole is small due to the formation of an outer skin layer, the compression molding is performed. The combustion wick according to claim 1, 2, or 18, wherein a surface orthogonal to the compression surface at the time is disposed facing the ignition member.