Kerosene heater

Abstract

A kerosene heater is provided with a structure of a combustion chamber capable of continuing combustion in a stabilized flame condition and prevents a state of an incomplete combustion condition perfectly. The kerosene heater of the invention is a type wherein kerosene supplied from a kerosene supply chamber is combusted in a combustion chamber between an inner flame cylinder and an outer flame cylinder positioned in an outer cylinder, respectively, and the kerosene supply chamber and a kerosene storage chamber provided at the outer periphery of the kerosene supply chamber are connected to each other by two communication pipes, wherein blast processing is applied to the inner flame cylinder and the outer flame cylinder at least at the combustion chamber side, which has a rough surface.

Description

FIELD OF THE INVENTION

[0001] The invention relates to a combustion chamber of a kerosene heater, particularly to an inner surface structure of the combustion chamber capable of effecting stable and complete combustion and of completely preventing the flame from uprising during the combustion of kerosene.

BACKGROUND OF THE INVENTION

[0002] FIG. 1 shows the entire structure of a conventional kerosene heater 10, which was formerly proposed by the inventor of this application.

[0003] A fuel tank 11 of the kerosene heater 10 comprises a kerosene storage tank 12 and kerosene supply chamber 13 for supplying kerosene to wick and a combustion wick body 17 is disposed in an opening 14 of the kerosene supply chamber 13, and the lower end of the combustion wick body 17 reaches under a kerosene (liquid) surface and the upper end thereof is positioned at a combustion chamber 25 of a combustion portion 20.

[0004] The liquid surface in the kerosene supply chamber 13 is maintained constant at a given level by two communication pipes PA, PB which communicates the kerosene storage tank 12 and the kerosene supply chamber 13. When the liquid surface LB descends by the consumption of kerosene, and becomes lower than the end part of the communication pipe PA at the kerosene supply chamber 13, thereby the kerosene inside the kerosene storage tank 12 flows into the kerosene supply chamber 13 through the communication pipe PB. As a result, the liquid surface LB ascends. Meanwhile if the end part of the communication pipe PA becomes lower than the liquid surface LB, a pressure inside the kerosene storage tank 12 is lowered and the air over the kerosene supply chamber 13 flows into the kerosene storage tank 12 through the communication pipe PA, and hence pressures in both the kerosene storage tank 12 and kerosene supply chamber 13 balance with each other to keep the liquid surface LB constant.

[0005] Other general structure of the kerosene heater 10 is same as that of the conventional kerosene heater. Number 15 indicates a wire net provided for stabilizing flame and radiating infrared ray after heating. A vertical adjustment knob 16 is for adjusting combustion wick body 17. A knob 18 is for opening and closing the combustion portion 20.

[0006] In FIG. 1, the left side half shows the lowered position of the combustion wick body 17, a non-combustion position while the right side half shows the combustion position of the combustion wick body 17. FIG. 2 is a side view of the combustion portion 20 of the kerosene heater 10, a half of which is a sectional view, which shows a feature of the invention. A combustion cylinder (chimney) 21 has, as a whole, an inner flame cylinder 23 and an outer flame cylinder 24 forming the combustion chamber 25 in an outer cylinder 22. Although the tip end of the combustion wick body 17 at the combustion position is positioned at the lower inner portion of the combustion chamber 25 shown at the right side in FIG. 1, the combustion wick body 17 is not shown in FIG. 2.

[0007] The conventional kerosene heater shown in FIG. 1 is structured such that a combustion power or combustion condition is adjusted by the degree of projection of the tip end of the combustion wick body 17 inside the combustion chamber 25, and hence the vertical adjustment knob 16 is rotated for adjusting. However, according to the conventional kerosene heater, uprising of the flame is generated as combustion time elapses even if the flame condition has been appropriately controlled by adjusting the tip end position of the combustion wick body 17 by the vertical adjustment knob 16, causing a problem of overheating condition.

[0008] The combustion condition is shown more in detail referring to FIGS. 7 and 8 showing the condition of flame during the combustion, namely, normal flame state and uprising state of the flame. According to the combustion portion 20 forming the combustion chamber 25 by the inner flame cylinder 23 and the outer flame cylinder 24, the uprising of the flame F is generated as the combustion time elapses as shown in FIG. 8, even after the tip end position of the combustion wick body 17 is adjusted to the optimum combustion condition shown in FIG. 7, causing a problem of an incomplete combustion condition and an excessive combustion condition so that the entire heater becomes in an over heated condition, causing a dangerous case.

[0009] Although the reason of uprising of flame generated during combustion time elapsed is not theoretically explained, the increase of temperature in the inner flame cylinder 23 and the outer flame cylinder 24 constituting the combustion chamber 25, and the luster of the surfaces of both the inner flame cylinder 23 and the outer flame cylinder 24 are conjectured to cause uprising of flame inside the combustion chamber 25. Both the inner flame cylinder 23 and the outer flame cylinder 24 having such lustrous surfaces are very small in fluid resistance of combustion fluid current in the combustion chamber 25 and flame is expected to uprise by about 20 cm to 30 cm as ten minutes elapses after adjustment of the flame.

[0010] Whereupon, if the projected tip end of the combustion wick body 17 is reduced to avoid such an excessive combustion condition, or a gap between the inner flame cylinder 23 and the outer flame cylinder 24 is lessoned so as to prevent the flame inside the combustion chamber 25 from being biased, a tarry substance which is generated as a result of incomplete combustion condition is accumulated in the vicinity of the tip end of the combustion wick body 17 positioned under the combustion chamber 25, which further causes a problem of incomplete combustion condition. Soot which is generated due to incomplete combustion is stuck to a wire net made of specific wire, stopping the emission of heat from the wire net which is very dangerous.

[0011] Both the inner flame cylinder 23 and the outer flame cylinder 24 which constitute the combustion portion are generally manufactured by lustrous stainless plate in the conventional kerosene heater.

SUMMARY OF THE INVENTION

[0012] The invention has been developed to solve the problems of the conventional kerosene heater, and it is an object of the invention to provide a kerosene heater with a structure of a combustion chamber capable of continuing combustion in a stabilized flame condition and not in an incomplete combustion condition.

[0013] A kerosene heater of the invention is a type wherein kerosene supplied from a kerosene supply chamber is combusted in a combustion chamber comprising inner flame cylinder and an outer flame cylinder positioned in an outer cylinder, respectively, and the kerosene supply chamber and a kerosene storage chamber provided at the outer periphery of the kerosene supply chamber are connected to each other by two communication pipes, wherein blast processing is applied to the inner flame cylinder and the outer flame cylinder at least at the combustion chamber side, which has a rough surface. The blast processing is applied to the surfaces of the inner flame cylinder and the outer flame cylinder, after making the forms of both flame cylinders of lustrous stainless plate, and further the inner peripheral surface of the outer cylinder may be painted by black color.

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG. 1 is an external schematic view of an entire heater and one half of which is a sectional view;

[0015] FIG. 2 is a side view of a combustion portion one half of which is illustrated by a section;

[0016] FIG. 3 is a front view of an inner flame cylinder;

[0017] FIG. 4 is a front view of an outer flame cylinder;

[0018] FIG. 5 is a plan view of a material of a plate forming the inner flame cylinder;

[0019] FIG. 6 is a front view of an outer cylinder;

[0020] FIG. 7 is a view for explaining a flame condition of a heater during the combustion of kerosene; and

[0021] FIG. 8 is a view for explaining another flame condition of a heater during the combustion of kerosene.

PREFERRED EMBODIMENT OF THE INVENTION

[0022] A preferred embodiment of the invention is now described with reference to FIGS. 2 to 6.

[0023] FIG. 2 shows a combustion portion 20 in a conventional kerosene heater 10 in FIG. 1. The combustion portion 20 comprises a flame stabilizing wire net positioned over an outer cylinder 22 and a knob 18 for opening and closing the combustion portion 20. A combustion chamber 25 has a circular space formed by an inner flame cylinder 23 and an outer flame cylinder 24, and a tip end of a combustion wick body 17 is moved up and down at the lower end of the combustion chamber 25 by a vertical adjustment knob 16.

[0024] In FIG. 2, the right half of the combustion portion 20 is illustrated by a section wherein many vent holes indicated by h, are provided on the surface of both the inner flame cylinder 23 and the outer flame cylinder 24, and air is supplied to the combustion chamber 25 through the inside or outside holes thereof. 26 is a scale bar for adjusting a relative position between the outer cylinder 22, the inner flame cylinder 23 and the outer flame cylinder 24 and depicted by H is a long hole for the scale bar 26.

[0025] FIG. 3 and FIG. 4 are front views of the inner flame cylinder 23 and the outer flame cylinder 24, respectively, constituting the feature of the invention. As is evident from FIG. 3, many vent holes, h, and the long hole H for the scale bar 26, are shown on the outer peripheral surface of the inner flame cylinder 23, and minute irregularities are also shown on the same surface, wherein many minute spots represent irregular surface or a rough surface formed of minute irregularities.

[0026] That is, the rough surface of the inner flame cylinder 23 which is the most characteristic structure of the invention is obtained by applying blast processing such as sand blast to the surface of stainless plate wherein although the irregularities themselves are very minute, the surface has no luster and is processed roughly. However, the inner peripheral surface of the inner flame cylinder 23 may be an ordinary luster.

[0027] Although FIG. 4 shows the outer flame cylinder 24 with an inner surface, inside of which is applied in the same blast processing way as the outer peripheral surface of the inner flame cylinder 23, it only shows many vent holes, h, on a ordinal luster stainless plate of 24.

[0028] It is not necessary to change particularly the shapes and dimensions of both the inner flame cylinder 23 and outer flame cylinder 24 according to the invention.

[0029] FIG. 5 shows a surface of a stainless plate 27 for manufacturing the inner flame cylinder 23 and many small vent holes h, h . . . are bored on the surface, and long holes H, H . . . are bored to define the positional relation between the inner flame cylinder 23, outer flame cylinder 24 and the outer cylinder 22. Both ends of the stainless plate 27 are fixed by rivets or the like to form a cylinder body. At that time, the blast processing which is the feature of the invention can be applied to the plate body of the stainless plate 27 before it is processed in a cylinder body and also applied to the surface side after manufacturing the inner flame cylinder 23 body shown in FIG. 3.

[0030] FIG. 6 is a front view of the typical outer cylinder 22, a part of which is represented as a section. According to the embodiment of the invention, black or dark paint is applied onto the inner surface 25-1 of the outer cylinder 22. A flame stabilizing wire net 15 or the like is fitted onto the upper portion of the outer cylinder 22 as shown in FIG. 2, the scale bars 26 are inserted crosswise from the long holes H which are provided in stagger while they are crossed each other and they support the inner flame cylinder 23 and outer flame cylinder 24.

[0031] According to the structure of the combustion chamber of the invention, very stabilized combustion condition can be maintained wherein particularly the generation of uprising of flame is prevented even after the elapse of combustion time upon regulation of flame,.

[0032] Furthermore, the flame condition is stabilized, and even if the temperature of heater is increased, it is not necessary to adjust the combustion wick body to an extremely small, so the incomplete combustion is not occurred.

Claims

1. A kerosene heater comprising a kerosene supply chamber, a kerosene storage chamber and a combustion chamber comprising inner flame cylinder and an outer flame cylinder, in which a kerosene storage chamber connected to the kerosene supply chamber by two communication pipes, wherein at least the surface the combustion chamber side of the inner flame cylinder and the outer flame cylinder have a rough surface by blasting.

2. The kerosene heater according to the claim 1, wherein the blasting is applied after the formation of the inner flame cylinder and the outer flame cylinder.

3. The kerosene heater according to the claim 1, wherein both the inner flame cylinder and the outer flame cylinder are made up of a lustrous stainless plate.

4. The kerosene heater according to the claim 1, wherein an inner peripheral surface of the outer cylinder is black.

5. The kerosene heater according to the claim 1, wherein both the inner flame cylinder and the outer flame cylinder are made up of the lustrous stainless plate, and the blast processing is applied after the formation of the inner flame cylinder and the outer flame cylinder.

6. The kerosene heater according to the claim 1, wherein both the inner flame cylinder and the outer flame cylinder are made up of the lustrous stainless plate, and an inner peripheral surface of the outer cylinder is black.