JPS6136129B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion wick used in kerosene stoves, etc., and its purpose is to have sufficient fuel suction and vaporization ability, as well as to be flexible, strong, and highly workable. Another object of the present invention is to provide a liquid fuel combustion wick that has excellent heat resistance and mechanical strength.

Liquid fuel combustion wicks used in suction vaporization type liquid fuel combustors such as portable kerosene stoves have conventionally been made of heat-resistant fibers such as glass fibers and carbon fibers, cotton,
Braided bodies made of a blend of cotton wool and the like are often used, but liquid fuel combustion wicks made of these materials have the following drawbacks.

The effective pore density (hereinafter referred to as porosity) for fuel uptake per apparent volume is only 40 to 50%, and the amount of fuel retained is small. Therefore, the tip of the combustion wick becomes hot during combustion, and a large amount of tar-like substances are produced. This tar-like substance obstructs fuel uptake, blocks the vaporization surface, reduces the amount of fuel vaporized, and worsens combustion conditions, causing odor, soot, and
Otherwise, it could easily lead to problems such as the generation of toxic carbon monoxide.

In addition, the accumulation of the tar-like substance increases the thickness of the liquid fuel combustion wick, making it impossible to move the liquid fuel combustion wick up and down, leading to a dangerous situation in which fire extinguishing operations are impossible. There were cases.

In order to remove this tar-like substance, a so-called dry firing method is generally used in which the fuel supply is stopped and combustion is continued.
Although it has heat resistance of up to 400°C, it cannot withstand high temperatures of 500 to 600°C or higher, which would remove carbon-rich tar-like substances, and it melts or becomes brittle. Therefore, when conventional liquid fuel combustion wicks are used, high-temperature dry firing cannot be performed to prevent the above-mentioned heating embrittlement, and tar-like substances cannot be removed sufficiently.

The present invention solves the above-mentioned conventional drawbacks, and one embodiment thereof will be described below with reference to the accompanying drawings.

In FIG. 1, numeral 1 denotes the main core, which is mainly made of silica-alumina ceramic fiber. The tip portion 1a of the main core 1 contains a heat-resistant inorganic binder such as colloidal silica or alumina sol, and the lower portion 1b
contains oil-resistant organic binders such as polyvinyl acetate, polychloroprene, and polyacrylic esters. Reference numeral 2 denotes a wicking core, which is made of cloth or string-like material such as cotton or polypropylene. Reference numeral 3 denotes a sewing thread, which is used to sew the main parts of the main core 1 and the suction core 2. A fire wick 4 is made of a heat-resistant material such as silica cloth or carbon fiber, and may be held between the main wick 1 or attached to the side.

In the above configuration, the main core 1 has a porosity of 80 to 90% and can be bonded and molded with a binder,
The fuel content per unit volume is much higher than that of conventional combustion wicks such as glass fiber. Therefore, the phenomenon in which the tip of the main core 1 becomes hot during combustion and tar-like substances are rapidly generated and accumulated is significantly suppressed. Therefore, problems such as deterioration of combustion conditions, attenuation of combustion vaporization amount, or inability to extinguish fire due to tar-like substances are avoided, and stable and safe combustion can be maintained over a long period of time.

Here, the lower part 1b of the main core 1 is made of silica-alumina material bonded with an oil-resistant organic binder, and is highly flexible and strong, so it can be cut, molded,
Sutures etc. can be done freely. That is, it can be easily processed into either a flat plate or a cylindrical shape, and can also be connected to the wick 2 made of cotton, polypropylene, etc. by sewing. In addition, since it is flexible, even if it is sewn with the wicking core 2 as described above, or even if the wicking core is overlapped with the main core 1 and pasted with a tape-like material, the adhesion at the contact area is good.
Fuel siphoning performance is not hindered. Furthermore, it is strong enough to withstand shocks during transportation, assembly, and use.

Any oil-resistant organic binder such as polyvinyl acetate, polychloroprene, or polyacrylic acid ester can be used as this organic binder, but when these binders are continuously heated to 150 to 200°C, The organic binder decomposes and gradually loses its binding strength, and most of the organic binder in the parts heated by dry firing is decomposed and removed, and the main core 1 becomes extremely brittle.
Here, the tip 1a of the main core 1 is made of colloidal silica,
If it is bonded with a heat-resistant inorganic binder such as alumina sol, the heat-resistant strength will increase to over 1000℃, and the characteristics of the main core 1b will not be impaired in any way even after repeated dry firing, making it stable for a long time. It is possible to maintain a certain amount of combustion. Further, when tar-like substances accumulate near the tip 1a of the main core 1 during combustion, heating shrinkage of the tar-like substances occurs, and along with this, the main core 1
itself is subject to shrinkage stress. If the entire main core 1 is bonded only with an organic binder, the tip may curve due to the above-mentioned shrinkage effect, and the main core 1 may become unable to move up and down. Shrinkage can be prevented by increasing the mechanical strength of the portion 1b with an inorganic binder.

This inorganic binder can also be impregnated into the tip portion 1a after the main core 1 is molded, and does not impair the good workability of the main core 1 bonded with the organic binder. In addition, even if the tip 1a of the main core 1 contains both an organic binder and an inorganic binder, or by impregnating the inorganic binder and then heating it to decompose and remove the organic binder, the inorganic binder can be removed. However, the above-mentioned effects are fully satisfied in either case.

The main core 1 is mainly made of silica-based, silica-alumina-based, or alumina-based ceramic fiber, but by mixing heat-resistant materials such as glass fiber and carbon fiber with it, these can be made into long-fiber materials. It can also increase toughness. Alternatively, an auxiliary wick made of these heat-resistant materials, such as the fire wick 4 shown in FIG. 1, may be installed, and any of these will enhance the performance without impairing the above-mentioned effects.

Furthermore, as shown in FIG. 2, the lower part of the main wick 1 may be directly impregnated with fuel, and the presence or absence of the wick 2 made of cotton, polypropylene, etc. does not interfere with the effects of the present invention. isn't it.

As described above, the liquid fuel combustion wick of the present invention suppresses the generation of tar-like substances, enables stable and safe combustion over a long period of time, and has excellent processability, heat resistance, and mechanical strength. And its value is extremely great.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway view of one embodiment of the liquid fuel combustion wick of the present invention, and FIG. 2 is a partially cutaway view of another embodiment. 1... Main core, 2... Wicking core, 3... Sewing thread,
4... Fire wick.

Claims (1)

[Scope of Claims] 1 The main material is ceramic fiber such as silica-alumina, the tip part contains at least a heat-resistant inorganic binder such as colloidal silica, and the other part contains at least polyvinyl acetate, polychloroprene, etc. A liquid fuel combustion wick characterized by containing an oil-resistant organic binder. 2. The liquid fuel combustion wick according to claim 1, which is made of a ceramic fiber mixed with or attached with a heat-resistant material such as glass fiber or carbon fiber.