JP2004333099A - Gas burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas burner capable of carrying out combustion in a favorable state with little danger of explosion, and capable of changing a form of heating in response to the type of an object to be heated. <P>SOLUTION: A through-hole 6 is formed in an upper wall part of a mixed gas chamber 2 supplied with mixed gas of combustion gas and air, a combustion plate 11 made of a porous material is provided on its upper side, and mixed gas from the mixed gas chamber 2 is burned on a top face of the combustion plate 11. A space part 7 for communicating mixed gas with a cross-sectional area that is wider than the through-hole 6 is provided between an upper end of the through-hole 6 and a bottom face of the combustion plate 11 so that mixed gas flowing out through the through-hole 6 from the mixed gas chamber 2 is distributed well to the bottom face of the combustion plate 11. A packing 13 with an opened center part is interposed between a top face of the mixed gas chamber 2 and the bottom face of the combustion plate 11. It is structurally simple and preferable to use an opening of the packing 13 as the space part 7 for communicating mixed gas. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a gas burner suitable for heating food such as rice crackers while grilling.
[0002]
[Prior art]
The gas burner used in the above applications has a relatively simple configuration in which a hole is made in a part of a steel pipe to which a mixed gas obtained by mixing a combustion gas and air is supplied, and the mixed gas discharged from the hole is directly burned. There are many things.
[0003]
[Problems to be solved by the invention]
However, this type of gas burner burns the mixed gas near the outer surface of the steel pipe, so that the steel pipe becomes hot, and there is a danger that the mixed gas in the steel pipe may ignite and cause an explosion (flashback). In addition, since the heating target is limited to a form in which the heating target is directly heated by the heat of the flame, it is difficult to adjust the degree of burning, and there is a problem that it is difficult to cope with different types of the heating target. Therefore, an object of the present invention is to provide a gas burner that can be burned in a good state without danger of explosion and that can change a heating mode according to a type of an object to be heated.
[0004]
[Means for Solving the Problems]
In order to solve the above problem, the present invention employs the following technical means. That is, in the gas burner according to the first aspect, a through hole is formed in an upper wall portion of a mixed gas chamber to which a mixed gas obtained by mixing a combustion gas and air is supplied, and a large number of small holes communicating vertically above the mixed gas chamber. A gas burner configured to provide a ceramic plate having: and burning the mixed gas from the mixed gas chamber on an upper surface of the ceramic plate, wherein a through hole is provided between an upper end of the through hole and a lower surface of the ceramic plate. A mixed gas circulation space having a product larger than the opening area of the mixed gas is provided.
[0005]
The mixed gas in the mixed gas chamber flows out through the through-hole into the space where the ceramic plate is housed, and further passes through the small holes of the ceramic plate from bottom to top to reach the upper surface of the ceramic plate, where the mixed gas is burned. I do. The combustion position of the mixed gas and the mixed gas chamber are separated from each other, and the combustion part is made of a ceramic plate with high heat insulation, so that the heat generated by the combustion is hardly transmitted to the mixed gas chamber. Low risk of ignition. Further, since the mixed gas circulation space having an area larger than the opening area of the through hole is provided between the upper end of the through hole and the lower surface of the ceramic plate, the mixed gas flowing out of the through hole is formed on the ceramic plate. A difference in flow velocity occurs at the lower surface, and a large flame is formed immediately above the through hole where the flow velocity is high, and a small flame is formed in a peripheral portion where the flow velocity is relatively low. For this reason, a large flame can be formed in the center portion, and even if the flow velocity is increased, the flame is held by the surrounding flame, so that the flame is not blown out.
[0006]
As described in claim 2, when a packing having a central portion opened is interposed between the upper surface of the mixed gas chamber and the lower surface of the ceramic plate, and the opening of the packing is a space for flowing the mixed gas, the number of parts can be reduced. The mixed gas circulation space can be obtained with a simple structure having a small number of components.
[0007]
Further, as described in claim 3, a packing is mounted on the upper surface of the mixed gas chamber, a ceramic plate is mounted thereon, and the ceramic plate is fixed to the mixed gas chamber by a detachable plate pressing plate. With this configuration, replacement and maintenance of the ceramic plate and the packing are facilitated. By adjusting the height of the mixed gas flow space by changing the thickness of the packing, the distribution of the mixed gas supplied to the upper surface of the ceramic plate is changed, and the state of combustion changes.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be specifically described with reference to the drawings. FIG. 1 et seq. Show a typical embodiment of the present invention. This gas burner 1 is composed of a mixed gas chamber 2 made of a thin steel plate which is long in the left-right direction and a combustion section 3 provided on the upper side thereof. .
[0009]
A mixed gas of combustion gas and air is supplied to the mixed gas chamber 2 from a supply port 5 formed on the left end face. Then, the supplied mixed gas passes through a plurality of through holes 6 formed at predetermined intervals in the left-right direction in the upper wall portion of the mixed gas chamber 2 and enters the mixed gas distribution space 7 of the combustion section 3. leak. In the mixed gas chamber 2, guide plates 8 are provided obliquely so that the effective cross-sectional area of the mixed gas chamber becomes smaller as the distance from the supply port 5 becomes smaller, and the amount of mixed gas flowing out from each through hole 6 becomes substantially constant. It is becoming.
[0010]
The combustion part 3 is provided with a pair of front and rear plate holding plates 10 with their inner ends rising upwardly fixed to the upper surface of the mixed gas chamber 2, and a plurality of porous ceramic plates 11 are provided in the space inside the holding plates 10. (Four sheets in the illustrated example) are arranged side by side, and the ceramic plate 11 is pressed and fixed from above by a pair of front and rear plate holding plates 12. The ceramic plate 11 has a number of small holes 11a,.
[0011]
As shown in FIG. 5, between the mixed gas chamber 2 and the ceramic plate 11, a packing 13 having a central portion opened and having a shape as viewed in plan is interposed. The opening of the packing 13 serves as the mixed gas flow space 7. Further, a pair of front and rear elongated plate-like packings 14, 14 are interposed between the ceramic plate 11 and the plate holding plate 12, respectively. Further, a packing 15 is also interposed at the boundary between the ceramic plates 11. These packings 13, 14, 15 are made of a heat insulating material such as kao wool.
[0012]
The plate holding plate 10 is fixed to the outer surface of the mixed gas chamber 2 by welding. Then, a nut 18 is fixed to the mounting plate 17 integrated with the plate holding plate 10 by spot welding by welding, and a screw 19 is screwed to the nut 18 to fix the plate holding plate 12 to the plate holding plate 10. I have. With this configuration, the replacement and maintenance of the ceramic plate 11 and the packings 13, 14, 15 can be easily performed by removing the screws 19 and removing the plate holding plate 12. Further, since no screw hole is formed in the outer wall of the mixed gas chamber 2, there is no possibility that the mixed gas in the mixed gas chamber 2 leaks. Further, since the plate holding plate 10 and the plate holding plate 12 have a box-shaped structure in cross section, there is an effect of improving strength. A plurality (three in the illustrated example) of the plate holding plate 10 and the plate holding plate 12 are arranged in the left and right direction in accordance with the left and right length (for four plates) of the ceramic plate 11. The plate holding plate 10 and the plate holding plate 12 are shifted left and right to prevent a decrease in strength.
[0013]
The mixed gas supplied to the mixed gas chamber 2 flows out into the mixed gas circulation space 7 through the through hole 6, and further passes through the small holes 11 a,. It reaches the upper surface and burns here. Since the mixed gas circulation space 7 is formed between the upper end of the through hole 6 and the lower end of the ceramic plate 11, the mixed gas spreads well on the lower surface of the ceramic plate 11, and the entire combustion area on the upper surface of the ceramic plate 11 is formed. Is supplied with a mixed gas. Actually, a large amount of combustion gas is collected at the center of the ceramic plate 11 directly above the through hole 6, and combustion occurs around the center.
[0014]
For example, when the thickness of the packing 13 (the height of the mixed gas flow space 7) is about 1 mm, a large main frame A is generated immediately above the through hole 6, as shown in FIGS. There is almost no flame around it and the ceramic plate 11 is in a state of red heat B. If the packing 13 is made thicker than this, a small blue flame or blue frame C is generated around the main frame A as shown in FIG. As described above, by changing the thickness of the packing 13, the state of combustion can be changed. Therefore, it is possible to select a mode in which the object to be heated is heated by the fire power of the flame and the radiant heat of the glowing ceramic plate 11 and a mode in which the object to be heated is mainly heated only by the flame according to the type of the object to be heated. It is possible. By removing the detachable plate holding plate 12, the packing 13 can be easily replaced, so that the heating mode can be easily changed.
[0015]
In this gas burner 1, the combustion position of the mixed gas and the mixed gas chamber 2 are separated from each other, and the combustion part is made of a ceramic plate 11 having high heat insulation. There is little danger of igniting the mixed gas in the mixed gas chamber and it is safe. Further, even if the main frame A is extinguished by wind or the like, re-ignition is immediately performed by heat around the blue frame C or the like, and there is no possibility that incomplete combustion occurs. Furthermore, since the combustion part 3 is constituted by arranging a plurality of ceramic plates 11, a burner having an appropriate length suitable for the conditions of the use site can be easily made by increasing or decreasing the number of ceramic plates 11. .
[0016]
【The invention's effect】
As described above, in the gas burner according to the present invention, since the combustion position of the mixed gas and the mixed gas chamber are separated from each other, and the combustion section is made of a ceramic plate having high heat insulation, the mixing in the mixed gas chamber is prevented. It is safe with little risk of ignition of gas. Further, by providing the mixed gas flow space between the upper end of the through hole and the lower surface of the ceramic plate, the circulation of the mixed gas to the lower surface of the ceramic plate is improved, and good combustion can be obtained. If the distance between the upper end of the through hole and the lower surface of the ceramic plate is changed, the form of combustion can be changed, and various types of heating can be performed in accordance with the type of the fuel heating object.
[0017]
In particular, with the configuration described in claim 2, the mixed gas circulation space can be obtained with a simple structure having a small number of parts. Further, with the configuration described in claim 3, replacement and maintenance of the ceramic plate and the packing are facilitated.
[Brief description of the drawings]
FIG. 1 is a (a) front view and (b) a plan view of a gas burner.
FIG. 2 is a front sectional view of a gas burner.
FIG. 3 is a partially enlarged view of FIG. 2 showing a combustion state.
FIG. 4 is a sectional view taken along the line SS in FIG. 2;
FIG. 5 is a perspective view of a packing.
FIG. 6 is a sectional view of a combustion section showing a combustion state.
FIG. 7 is a sectional view of a combustion section showing a combustion state different from that of FIG. 6;
[Explanation of symbols]
REFERENCE SIGNS LIST 1 gas burner 2 mixed gas chamber 6 through hole 7 mixed gas circulation space 10 plate holding plate 11 ceramic plate 11 a small hole 12 ceramic plate holding plate 13, 14, 15 packing

Claims (3)

A through hole is formed in an upper wall portion of a mixed gas chamber to which a mixed gas obtained by mixing a combustion gas and air is supplied, and a ceramic plate having a number of small holes vertically communicated is provided above the mixed gas chamber, and the ceramic plate is provided with a through hole. A gas burner configured to burn the mixed gas from the mixed gas chamber on the upper surface of the mixed gas, the mixed gas having an area larger than an opening area of the through hole between an upper end of the through hole and a lower surface of the ceramic plate. A gas burner having a space for distribution. 2. The gas burner according to claim 1, wherein a packing having a central portion opened is interposed between the upper surface of the mixed gas chamber and the lower surface of the ceramic plate, and the opening of the packing is used as a mixed gas circulation space. 3. The gas burner according to claim 2, wherein a packing is mounted on an upper surface of the mixed gas chamber, a ceramic plate is mounted thereon, and the ceramic plate is fixed to the mixed gas chamber by a plate holding plate which is detachable.

Images